Abstract: An apparatus for measuring a spatially under-sampled Bidirectional Reflectance Distribution Function (BRDF) of a surface. The apparatus may comprise a first light source directed to illuminate the surface from a first illumination direction, and a plurality of sensors positioned to receive light reflected by the surface. The plurality of sensors may comprise first, second and third sensors positioned to receive light reflected by the surface in first, second and third non-coplanar directions. In various embodiments, the apparatus may also comprise a computer in communication with the plurality of sensors. The computer is configured to convert light sensed by the plurality of sensors into a first appearance property of the surface considering the first, second, and third reflectance directions.

Abstract: A method for adjusting a color measurement of a secondary color measurement instrument. The method includes generating a profile for the secondary color measurement instrument based on color measurements of a master color measurement instrument, and applying the profile to adjust the color measurement of the secondary color measurement instrument.

Abstract: An apparatus for measuring a spatially under-sampled Bidirectional Reflectance Distribution Function (BRDF) of a surface. The apparatus may comprise a first light source directed to illuminate the surface from a first illumination direction, and a plurality of sensors positioned to receive light reflected by the surface. The plurality of sensors may comprise first, second and third sensors positioned to receive light reflected by the surface in first, second and third non-coplanar directions. In various embodiments, the apparatus may also comprise a computer in communication with the plurality of sensors. The computer is configured to convert light sensed by the plurality of sensors into a first appearance property of the surface considering the first, second, and third reflectance directions.

Abstract: Data from an imaging interferometer producing at least three interferometric images of a surface of an object using at least three different frequencies of light illuminating the surface of the object is processed through a software data processing pipeline architecture which uses data processed by a plurality of data processors to generate a three dimensional surface profile of the surface of the object.